// TODO: Note that most errors will result in a truncated listing.
func (z *erasureServerPools) Walk(ctx context.Context, bucket, prefix string, results chan<- ObjectInfo, opts WalkOptions) error {
	if err := checkListObjsArgs(ctx, bucket, prefix, ""); err != nil {
		xioutil.SafeClose(results)
		return err
	}

	ctx, cancel := context.WithCancel(ctx)
	var entries []chan metaCacheEntry