Individual quota entries can be viewed with xfs_db's dquot command.

# xfs_db -xr -c 'dquot username' -c p /dev/hdb1

# xfs_db -xr -c 'dquot -p projectname' -c p /dev/hdb1

inodes can be interrogated to determine which project they belong to.

> ls -ia
> sudo xfs_db -xr -c 'inode 675234191' -c p /dev/hdb1
...
core.projid = 33
core.uid = 0
core.gid = 0