code: def GetRootFileEntry(self):
      
      path_spec = compressed_stream_path_spec.CompressedStreamPathSpec(
          compression_method=self._compression_method,
          parent=self._path_spec.parent)
      return self.GetFileEntryByPathSpec(path_spec)
docs: Retrieves the root file entry.
  
      Returns:
        CompressedStreamFileEntry: a file entry or None if not available.