You can kind of get that on Kbin, though it shunts all the Mastodon stuff over to the "Microblogging" section. Also it's not exactly bug free right now: a lot of the time you won't see all of the replies to a post, especially if they're replies to replies (and so on and so forth).
The idea is there though, and the devs are working on it constantly, so one day it should work correctly.