setSerializer() not working on collection

i want to remove "data" from json. so i need to set ArraySerializer.

It's working fine with **item**.
return $this->response->item($user, new UserTransformer, function ($resource, $fractal) {
$fractal->setSerializer(new ArraySerializer);
});

but not working with **collection**

return $this->response->collection($users, new UserTransformer, function ($resource, $fractal) {
$fractal->setSerializer(new ArraySerializer);
});

Reference: https://github.com/dingo/api/wiki/Transformers#utilizing-the-callback