code: def GetRootFileEntry(self):
      
      path_spec = data_range_path_spec.DataRangePathSpec(
          range_offset=self._range_offset,
          range_size=self._range_size,
          parent=self._path_spec.parent)
      return self.GetFileEntryByPathSpec(path_spec)
docs: Retrieves the root file entry.
  
      Returns:
        DataRangeFileEntry: a file entry or None if not available.