code: def GetParentFileEntry(self):
      
      # If the file entry is a sub entry, return the SQLite blob directory.
      if self._is_virtual:
        return None
  
      path_spec = sqlite_blob_path_spec.SQLiteBlobPathSpec(
          table_name=self.path_spec.table_name,
          column_name=self.path_spec.column_name,
          parent=self.path_spec.parent)
      return SQLiteBlobFileEntry(
          self._resolver_context, self._file_system,
          path_spec, is_root=True, is_virtual=True)
docs: Retrieves the parent file entry.
  
      Returns:
        SQLiteBlobFileEntry: parent file entry or None if not available.