@Override
  public Set<String> supportedFileAttributeViews() {
    Set<String> result = new HashSet<>(myLocalFS.supportedFileAttributeViews());
    if (myMountedFS != null) result.addAll(myMountedFS.supportedFileAttributeViews());
    return result;
  }
@Override
  public Set<String> supportedFileAttributeViews()