nodejs取得ファイルの修正時間

var stat = fs.statSync(filename);
console.log(stat)

{ dev: 0,
  ino: 0,
  mode: 33206,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  size: 1747,
  atime: Tue, 03 Jan 2012 13:35:51 GMT,
  mtime: Tue, 03 Jan 2012 13:35:51 GMT,
  ctime: Wed, 21 Dec 2011 14:31:59 GMT }