public function filterRawAttributes(array $attributes = [], $keys = ['count', 'dn'])
    {
        $attributes = Arr::except($attributes, $keys);

        array_walk($attributes, function (&$value) use ($keys) {
            $value = is_array($value) ?
                $this->filterRawAttributes($value, $keys) :
                $value;
        });

        return $attributes;
    }