code: function Mode (stat) {
    if (!(this instanceof Mode)) return new Mode(stat);
    if (!stat) throw new TypeError('must pass in a "stat" object');
    if ('number' != typeof stat.mode) stat.mode = 0;
    this.stat = stat;
    this.owner = new Owner(stat);
    this.group = new Group(stat);
    this.others = new Others(stat);
  }
docs: /* 0000001 execute/search permission, others 
  `Mode` class.
  
  @param {fs.Stat} stat a "stat" object (anything with a `mode` Number property)
  @api public