Fat models - design question, where to put logic?

Hi, I've design question, where to put the code for situations like
this:

1. Shop -> hasMany -> Categories
2. Categories are TreeBehavior
3. For every Shop I put new root Category, so it look like:
- Root Category for Shop #1
--- Category 1
--- Category 2
- Root Category for Shop #2
--- Category 1
--- Category 2
So all Categories are in one tree and for every shop have new root
Category.

Now I need to know the root Category for Shop. Is this better to code:
Category::getRoot($shop_id)
or
Shop::getRootCategory($id)

This is specific case, but of course the question can be for common
situation (just treat Shop as X, and Category as Y).
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