Laravel - Additional custom validation only when previous passed

I have validation like this:

    $validator = Validator::make($request->all(), [
        'parent_id' => 'bail|required|integer|exists:tree_nodes,id',
        'name'      => 'bail|required|max:255',
        'position'  => 'bail|nullable|numeric',
        'path'      => 'bail|nullable|max:255'
    ]);

But I need additional custom validation for "path" field based on "parent_id", "name" and "path" fields values and executed only when previous simple validation passed. How to do that?

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