lrx22.g920aucu2aof4 BUild root?

I have a Samsung galaxy S6 from Att and its completely stock. I hate all the crap they have pre loaded on it and I do not really like samsungs interface, I am looking for stock android experience.

I heard rumor that the latest samsung update was not rootable is this true? If not whats the best way to root this phone, and any rom suggestions?