Version: 2017.4
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Transform.root

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public var root: Transform;
public Transform root;

Description

Returns the topmost transform in the hierarchy.

(This never returns null, if this Transform doesn't have a parent it returns itself.)

// Is a collision between two objects in different hierarchies?
function OnCollisionEnter(collision : Collision) {
    if ( collision.transform.root != transform.root ) {
        print("The colliding objects are not in the same hierarchy");
    }
}
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void OnCollisionEnter(Collision collision) { if (collision.transform.root != transform.root) print("The colliding objects are not in the same hierarchy"); } }