Cleanup tool for old blobs in partial clone

["Miłosz Kosobucki" <mikom3@gmail.com>]

Hello,

I recently looked into the partial clone functionality and how it could 
be used to replace Git LFS.

Let's say that I use partial clone where one directory is filtered out 
through --filter=sparse:oid=XXX. Let's also say it's a directory with 
big assets for a computer game.

Now, as the project progresses and new versions of assets are checked 
in, I'll accumulate many version of these assets as I get new versions. 
I won't need them though, because most of the time I'm interested only 
in the latest version.

So my question is: is there some tool (probably similar to git lfs 
prune) that will let me get rid of the blobs that I don't need anymore?

I couldn't find information about it anywhere in the docs. I vaguely 
remember a mention of something like that possibly being done in the 
future in partial clone (or maybe promisor remote?) patch mails but I 
couldn't find it again.

Best regards,
-- 
Miłosz Kosobucki