Diff between Unpack Prefab and Unpack Prefab Completely?

Hi! I was playing around with the new prefab workflow and a i wanted to understand the correct use of this two functionalities.

I Know that Unpack means to lose the reference to the prefab, but what means completely?

Thanks!

EDIT:

Correct Answer by Carpe-Denius

When unpacking a prefab it only removes the first level of the prefab reference.

When unpacking completely a prefab it removes every level of nested prefabs.

 

Every child prefab gets unpacked as well.

 

I see, i was testing with only one level of nested prefab. Every nested prefab (childs of childs) on the unpacked prefab are unliked. Thanks!