@Override
  public <V extends FileAttributeView> V getFileAttributeView(
      Path path, Class<V> type, LinkOption... options) {
    throw new UnsupportedOperationException();
  }
Returns a runnable that, when run, removes the file system with the given URI from this
provider.
jimfs/src/main/java/com/google/common/jimfs/SystemJimfsFileSystemProvider.java