code: public function storages(): \Generator
      {
          /** @var Storage $storage */
          foreach ($this->storage->list($this->recursive) as $storage) {
  
              // apply early lowlevel filters
              foreach ($this->storageFilters as $filter) {
                  if (!call_user_func($filter, $storage)) {
                      continue 2; // continue outer storage-loop
                  }
              }
  
              yield $storage;
          }
      }
docs: low-level storage iterator
  @param int|null $constraints
  @return Storage[]