vendor/github.com/containerd/containerd/fs/time.go

package fs

import "time"

// Gnu tar and the go tar writer don't have sub-second mtime
// precision, which is problematic when we apply changes via tar
// files, we handle this by comparing for exact times, *or* same
// second count and either a or b having exactly 0 nanoseconds
func sameFsTime(a, b time.Time) bool {
	return a == b ||
		(a.Unix() == b.Unix() &&
			(a.Nanosecond() == 0 || b.Nanosecond() == 0))
}