code: def GetRootFileEntry(self):
      
      path_spec = encrypted_stream_path_spec.EncryptedStreamPathSpec(
          encryption_method=self._encryption_method,
          parent=self._path_spec.parent)
      return self.GetFileEntryByPathSpec(path_spec)
docs: Retrieves the root file entry.
  
      Returns:
        EncryptedStreamFileEntry: a file entry or None if not available.