This has been asked for on the (broader) Fediverse for a long time, too.
(Longer than Threads has existed.)
Although, in practice, it is impossible to prevent it. Someone can take a screenshot of your post and comment on it — thus doing an ad hoc DIY quote-post.
RE:
https://www.threads.net/@zuck/post/DHbavhJvRIn#DeSo #Fediverse #FediverseUX #FediUX