code: function isstats (obj) {
    // genuine fs.Stats
    if (typeof Stats === 'function' && obj instanceof Stats) {
      return true
    }
  
    // quack quack
    return obj && typeof obj === 'object' &&
      'ctime' in obj && toString.call(obj.ctime) === '[object Date]' &&
      'mtime' in obj && toString.call(obj.mtime) === '[object Date]' &&
      'ino' in obj && typeof obj.ino === 'number' &&
      'size' in obj && typeof obj.size === 'number'
  }
docs: Determine if object is a Stats object.
  
  @param {object} obj
  @return {boolean}
  @api private