Memmy - An iOS client for Lemmy

Given the activity pub nature I think the closest you would get would be to filter by an instance. So your home instance would get all the ones it sees via the pub and then could filter based on name. To get a true "local" view you'd either have to auth anonymously as a different user (couldn't comment) or would have to log in to that instance as one of their users (disjointed comment history).

Edit: I think this goes under the umbrella of allowing individuals to filter instances, just a reverse application of it. I know that's an oft talked about feature.