lib/stalker.js
function (fPath, fnAdd, fnRemove, depth) {
    fs.stat(fPath, function onStat(err, stats) {
      if (err) { return fnAdd && fnAdd(err); }

      if (stats.isDirectory() && depth > 0) {
        //If we have a directory, watch it and recurse down
        watcher.checkFile(fPath, options.strict, function _checkFile(err, result) {
          if (err) { return fnAdd && fnAdd(err); }

          if (!result) {
            watcher.addFile(fPath, function _addFile() {
              //Clear out any old listeners. Is there a better way?
              if (typeof(handles[fPath]) === 'object') { handles[fPath].close(); }

              handles[fPath] = fs.watch(fPath, folderChanged(fPath, fnAdd, fnRemove));
            });
          }
        });

        //Recurse over anything in this directory
        fs.readdir(fPath, function _readdir(err, files) {
          if (err) { return fnAdd && fnAdd(err); }

          files.forEach(function (file) {
            if (file[0] === '.') { return; } //ignore files starting with "."

            var rPath = path.join(fPath, file);
//            console.log('depth later ' + depth)
            watchFolderTree(rPath, fnAdd, fnRemove, depth - 1 );
          });
        });
      }
      else if (stats.isFile()) {
        watcher.checkFile(fPath, options.strict, function _checkFile(err, result) {
          if (err) { return fnAdd && fnAdd(err); }
          if (!result) {
            watcher.addFile(fPath, function _addFile() {
              //If startSilent has been requested, do not fire the callbacks on first read of the directory 
              if (!options.startSilent) {
                return fnAdd && fnAdd(null, fPath);
              }
            });
          }
        });
      }
    });
  }
function (fPath, fnAdd, fnRemove, depth) {
    fs.stat(fPath, function onStat(err, stats) {
      if (err) { return fnAdd && fnAdd(err); }

      if (stats.isDirectory() && depth > 0) {
        //If we have a directory, watch it and recurse down
        watcher.checkFile(fPath, options.strict, function _checkFile(err, result) {
          if (err) { return fnAdd && fnAdd(err); }

          if (!result) {
            watcher.addFile(fPath, function _addFile() {
              //Clear out any old listeners. Is there a better way?
              if (typeof(handles[fPath]) === 'object') { handles[fPath].close(); }

              handles[fPath] = fs.watch(fPath, folderChanged(fPath, fnAdd, fnRemove));
            });
          }
        });

        //Recurse over anything in this directory
        fs.readdir(fPath, function _readdir(err, files) {
          if (err) { return fnAdd && fnAdd(err); }

          files.forEach(function (file) {
            if (file[0] === '.') { return; } //ignore files starting with "."

            var rPath = path.join(fPath, file);
//            console.log('depth later ' + depth)
            watchFolderTree(rPath, fnAdd, fnRemove, depth - 1 );
          });
        });
      }
      else if (stats.isFile()) {
        watcher.checkFile(fPath, options.strict, function _checkFile(err, result) {
          if (err) { return fnAdd && fnAdd(err); }
          if (!result) {
            watcher.addFile(fPath, function _addFile() {
              //If startSilent has been requested, do not fire the callbacks on first read of the directory 
              if (!options.startSilent) {
                return fnAdd && fnAdd(null, fPath);
              }
            });
          }
        });
      }
    });
  }
Takes a folder root and a callback and recurses through to a directory tree Calls fn(null, directory) whenever a file is added to one of the watched directories