code: function _read(stat, source, callback) {
    stat(source, _pathStated.bind(null, {}, stat, source, callback));
  }
docs: Reads path and builds json-comaptible object representing content
  of the path.
  @param {Function} stat - Function of fs module fs.stat or fs.lstat.
  @param {String} source - Path to source location on file system.
  @param {Function} callback - Callback that expects a possible error
  and the result.