Laravel Get 'belongsTo' relation from 'hasMany' relation

class Post {
    function category() {
        $this->belongsTo('Category');
    }
}
class User {
    function posts() {
        $this->hasMany('Post');
    }

    function categories() {
        //???
        $this->posts->category;
    }
}

I have code that looks like this, and I'm wondering how I can access "categories" on the user object and have it return a Laravel relation.

None of the existing relation methods "hasManyThrough", etc seem to fit this use case.

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