@Override
  public SeekableByteChannel newByteChannel(
      Path path, Set<? extends OpenOption> options, FileAttribute<?>... attrs) throws IOException {
    JimfsPath checkedPath = checkPath(path);
    JimfsFileChannel channel = newJimfsFileChannel(checkedPath, options, attrs);
    return checkedPath.getJimfsFileSystem().getFileStore().supportsFeature(FILE_CHANNEL)
        ? channel
        : new DowngradedSeekableByteChannel(channel);
  }
Returns the default file system view for the given path.
jimfs/src/main/java/com/google/common/jimfs/JimfsFileSystemProvider.java