After Effects, Matching Time when Time Remapping

This example is taken from an animation project of a character. The character's body is nested in it's own composition. To get the head to follow the body an expression needs to target not just a null object in the body composition but a null object is the nested composition so that the time remapping will apply.

code: thisComp.layer("nested comp").source.layer("null object in nested comp").transform.position