How to add alias on self laravel eloquent ? Laravel 5.3

My query mysql like this :

SELECT * 
FROM categories a
JOIN categories b ON b.parent_id = a.id
JOIN products c ON c.category_id = b.id
WHERE a.id = 1

I want change it to laravel eloquent

On the model category, I try like this :

self::join('categories b', 'b.parent_id', '=', 'a.id')
    ->join('products c', 'c.category_id', '=', 'b.id')
    ->findWhere(['a.id','=',$id]);

I'm confused add alias to self

How can I do it?

Note :

I want to use self. Not others

via samuel toh