code: function read_parent_directory_data(error, parentDirectoryNode) {
      if(error) {
        callback(error);
      } else if(parentDirectoryNode.type !== NODE_TYPE_DIRECTORY || !parentDirectoryNode.data) {
        callback(new Errors.ENOTDIR('a component of the path prefix is not a directory', path));
      } else {
        context.getObject(parentDirectoryNode.data, get_node_from_parent_directory_data);
      }
    }
docs: in: parent directory node out: parent directory data