xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup
/dev/vdb1 vdb 0 0 1048576 00 [--------] /var/backup
If the user has data in the project, that belongs to him, the result will change:
/dev/vdb1 vdb 512000 0 1048576 00 [--------] /var/backup
==== Modifiying a User Quota ====