func (cred Credentials) IsServiceAccount() bool {
	_, ok := cred.Claims[iamPolicyClaimNameSA]
	return cred.ParentUser != "" && ok
}

// IsImpliedPolicy - returns if the policy is implied via ParentUser or not.
func (cred Credentials) IsImpliedPolicy() bool {
	if cred.IsServiceAccount() {
		return cred.Claims[iamPolicyClaimNameSA] == "inherited-policy"
	}
	return false
}