Disk space remaining?

Is there some way to see how much available space is on a remote node that I’m synchronizing to? My friend and I may sync to each other for off-site backup, and it would be nice to see how much room is left on the remote storage space.

I see on the main Syncthing control panel, the “Local State (Total)” line that shows how many GB I have syncing, but I’m looking for how much remote space has not been used rather than how much is used.

No, this is not currently exposed in the protocol so there is no way for a remote device to know.