OK, uncovered something completely unexpected. I tested the NU7100 with the Roku TV profile, expecting trick play to work. Surprise, no FF. OK, that's what some of you had reported. However, when I changed the destination container to MPEGTS, voila, fast forward!
Now, don't expect to be able to FF a long ways into a movie after starting playback. It will only move forward as far as the video has been transcoded so far. That means at the beginning you probably can't FF much more than 30 seconds. But the longer the movie plays, and assuming a reasonably fast CPU in your Serviio computer, you should be able to get quite far after 4-5 minutes.
I found that the TV doesn't like VC-1 video, nor the WTV container. WMV videos also require transcoding. But again, fast forward works for all of them. However, resume isn't available for any video, even if transcoding isn't necessary. That seems to be a Samsung issue.
However, compared to my JU7100 it is playing videos from my server far better. My first choice is to still use either my Roku Ultra or Nvidia Shield for playback. The Samsung NU user interface is still just as lousy as it is in my JU series.
I will provide this profile to Zip for inclusion in the next Serviio release. In the meantime you can use this user profile file and select the Samsung TV (NU Series) profile.