Shrink filestore

[ErroErro]

I have a filestore extended up to 63TB.
After a deep cleaning the occupied space is 25 TB.
Is it possible to perform a shrink operation to reduce the allocated space to 26TB?
I tried a backup and restore operation on a new filestore instance but if the size isn't 63TB it won't let me do the restore.

Any suggestions?

thanks

Andrea