code: public static DirectoryStream.Filter<Path> notInCaches(Set<String> caches) {
          checkNotNull(caches, "set of active caches can't be null");
          return new NotInCachesFilter(caches);
      }
docs: To accept for cleaning only not active cache dirs
  
  @param caches set of active cache names, extracted with help of {@link #cacheToName()}
  
  @return filter to accept only names not in set