Thanks for the heads-up.
[UPDATE] Ah. Now I remember [0]
It does roughly that, but it still insists on bringing in the entire repo (as does all Git).
The thing that SS did, was allow you to create a "chimera" workspace, composed of just tiny parts of other workspaces.
It was a great way to share sample and SDK stuff, without, for example, sending over a ton of testing code.
Many of my repos have more testing code than implementation code; not to mention a ton of documentation.
[0] https://git-scm.com/docs/git-worktree