And I wasted so much time with zHardDiskMapMatch Image may be NSFW.
Clik here to view.
All mount points I want to ignore are under /dir1/chroot. As far as I understand, Zenoss uses re.search to match zFileSystemMapIgnoreNames against mount point. So, setting zFileSystemMapIgnoreNames to /dir1/chroot solved my problem at once.
Thank you very much for your advice!
