I have one bind mount on the system :
{{{
% grep bind /etc/fstab
/home/max /export/max none bind 0 0
% mount | grep bind
/home/max on /export/max type none (rw,bind)
% grep bind /etc/mtab
/home/max /export/max none rw,bind 0 0
}}}

I have activated PRUNE_BIND_MOUNTS in my updatedb.conf file.
{{{
% grep BIND /etc/updatedb.conf
PRUNE_BIND_MOUNTS="yes"
}}}

but updatedb is still parsing /export/max :
{{{
% locate -r '/backup$'
/export/max/backup
/home/max/backup
/home/postgres_backup/backup
}}}

I tried removing the old database, using the "--prune-bind-mounts yes" option on updatedb… but nothing change.

I attached the output of "updatedb --debug-pruning" and my updatedb.conf file.