Can anybody seem to stream 4k content via Airplay 2 from Macbook to Roku Premier or other Roku 4k device with Airplay? My understanding is that OS 9.4 supports Airplay 2, and airplay 2 is supposed to stream 4k, but I cannot get 4k resolution via airplay to my roku 4k player. Using the Roku normally the 4k comes through fine, just not airplay - is it really supported or is it apple playing their games again?