How to access the topmost object in the gameobject hierarchy in Unity?

Question

Unity

I shoot with raycast at one of the many colliders on objects that are in the attachments of the game object on which the script of the ColBehavior type hangs.
From the raycast script I get a link to the ColBehavior script via

behavior = shoot_ray.transform.GetComponentInParent<ColBehavior>();

Is there some way, when hitting any of the nested objects of the parent, immediately access the root itself, inside which everything is nested, bypassing the process of recursively enumerating one parent after another, until the root is reached?