directory/directory_transport.go
func (ref dirReference) PolicyConfigurationNamespaces() []string {
	res := []string{}
	path := ref.resolvedPath
	for {
		lastSlash := strings.LastIndex(path, "/")
		if lastSlash == -1 || lastSlash == 0 {
			break
		}
		path = path[:lastSlash]
		res = append(res, path)
	}
	// Note that we do not include "/"; it is redundant with the default "" global default,
	// and rejected by dirTransport.ValidatePolicyConfigurationScope above.
	return res
}
func (ref dirReference) PolicyConfigurationNamespaces() []string {
	res := []string{}
	path := ref.resolvedPath
	for {
		lastSlash := strings.LastIndex(path, "/")
		if lastSlash == -1 || lastSlash == 0 {
			break
		}
		path = path[:lastSlash]
		res = append(res, path)
	}
	// Note that we do not include "/"; it is redundant with the default "" global default,
	// and rejected by dirTransport.ValidatePolicyConfigurationScope above.
	return res
}
// PolicyConfigurationNamespaces returns a list of other policy configuration namespaces to search
// for if explicit configuration for PolicyConfigurationIdentity() is not set.  The list will be processed
// in order, terminating on first match, and an implicit "" is always checked at the end.
// It is STRONGLY recommended for the first element, if any, to be a prefix of PolicyConfigurationIdentity(),
// and each following element to be a prefix of the element preceding it.