Configure ProFTPd with SQLShowInfo

Hi all,

Running proFTPd 1.3.0 on Ubuntu 6.06 with MySQL 5, I want to configure
proFTPd to show the logged in user how much he/she has uploaded,
downloaded, with which speeds that happenend and how much free disc
space is left on the drive / chrooted dir.

Now the first ones are doable and I'm confident enough that I can make
the correct queries for them in time but how to show how much free
disc space is available in the dir, I don't know. Can't do that with an
sql query, right?

Someone who can help a bit?

Thnx in advance!

Laurens