

Yeah, junctions would be most similar to a mount point. Though you can also mount one directory under another, so it’s more like a directory hardlink in that case.
And symlinks were actually introduced in Vista, but for some reason you needed to be an Admin to create one. With Win10 they removed that restriction, but for some reason kept it behind a “developer mode” anyway, it’s strange.
Yes, thank you! I knew there was something like it on the *nix side, but the only thing that was coming to mind was overlayfs, which ain’t it.