Describe the bug

Layers stored in the PAX format can contain file access times and creation times in addition to modification times. However, the layerTime function only sets ModTime.

I believe this to be the root cause of issue 2005 in Kaniko.

Expected behavior

Images mutated with mutate.Time should set all timestamps in the image, including AccessTime and ChangeTime:

// Time sets all timestamps in an image to the given timestamp.
func Time(img v1.Image, t time.Time) (v1.Image, error) {