code: func NamespaceKeyRootFunc(ctx context.Context, prefix string) string {
  	key := prefix
  	ns, ok := genericapirequest.NamespaceFrom(ctx)
  	if ok && len(ns) > 0 {
  		key = key + "/" + ns
  	}
  	return key
  }
docs: // NamespaceKeyRootFunc is the default function for constructing storage paths
  // to resource directories enforcing namespace rules.