@ApiStatus.Internal
  public @NotNull VirtualFileSystemEntry createChild(int fileId,
                                                     int nameId,
                                                     @PersistentFS.Attributes int attributes,
                                                     boolean isEmptyDirectory) {
    synchronized (myData) {
      return createChildImpl(fileId, nameId, attributes, isEmptyDirectory);
    }
  }
@ApiStatus.Internal
  public @NotNull VirtualFileSystemEntry createChild(int fileId,
                                                     int nameId,
                                                     @PersistentFS.Attributes int attributes,
                                                     boolean isEmptyDirectory)