I use a variety of clients from the official website, to tusky to elk and i haven’t found a way to show only the content of the accounts i follow. All “Home” feeds additionally contain information i haven’t directly subscribed to.
How does this work?
I don’t think so, but you can enable “mute boosts” on accounts that boost a lot to clean up your timeline a bit.
The Home feed (in comparison to Local or Federated feeds) should only show the accounts you follow, but those posts will be made up of original posts by those you follow and anything they boost (as well as responses to and from mutual people you follow). As someone else has commented, you can hide boosts of those you follow by going into their individual profile page and choosing to hide their boosts.
You shouldn’t be getting anything else on your Home feed.