if update == nil && old != nil {
		return true
	}
	if update == nil || old == nil {
		return false
	}
	return *update < *old
}

// ValidateProcMountType tests that the argument is a valid ProcMountType.
func ValidateProcMountType(fldPath *field.Path, procMountType core.ProcMountType) *field.Error {
	switch procMountType {
	case core.DefaultProcMount, core.UnmaskedProcMount:
		return nil
	default: