@Override
  public DirectoryStream<Path> newDirectoryStream(
      Path dir, DirectoryStream.Filter<? super Path> filter) throws IOException {
    JimfsPath checkedPath = checkPath(dir);
    return getDefaultView(checkedPath)
        .newDirectoryStream(checkedPath, filter, Options.FOLLOW_LINKS, checkedPath);
  }
Returns the default file system view for the given path.
jimfs/src/main/java/com/google/common/jimfs/JimfsFileSystemProvider.java