[CentOS] xfs quota question

Thu Aug 9 19:57:25 UTC 2018
mark <m.roth at 5-cent.us>

Can I go to an existing xfs file system, and apply a soft quota to each
user on it? If I do, can I then run a report, and see who's using how
much, or does it only apply to files created after the quotas are applied?