type FileInfo interface {
 Name() string  // base name of the file
 Size() int64  // length in bytes for regular files; system-dependent for others
 Mode() FileMode  // file mode bits
 ModTime() time.Time // modification time
 IsDir() bool  // abbreviation for Mode().IsDir()
 Sys() interface{} // underlying data source (can return nil)
}
 A FileInfo describes a file and is returned by Stat and Lstat.

func timespecToTime(ts syscall.Timespec) time.Time {
 return time.Unix(int64(ts.Sec), int64(ts.Nsec))
}

func main() {
 finfo, _ := os.Stat(filename)
 // Sys()返回的是interface{}，所以需要类型断言，不同平台需要的类型不一样，linux上为*syscall.Stat_t
 stat_t := finfo.Sys().(*syscall.Stat_t)
 fmt.Println(stat_t)
 // atime，ctime，mtime分别是访问时间，创建时间和修改时间，具体参见man 2 stat
 fmt.Println(timespecToTime(stat_t.Atim))
 fmt.Println(timespecToTime(stat_t.Ctim))
 fmt.Println(timespecToTime(stat_t.Mtim))
}