By the way... This is from one of our backup servers, recently upgraded to Jessie and configured to use systemd. Works fine:
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /
UUID=a2a19a05-0ab1-4384-839c-2c1a9dd245fc / reiserfs notail,noatime,user_xattr 0 1
UUID=a2a19a05-0ab1-4384-839c-2c1a9dd245fc /mnt/root reiserfs notail,noatime,user_xattr 0 0
UUID=7938e468-01e4-4be5-9a5d-db29da37ced4 /mnt/root/var reiserfs notail,noatime,user_xattr 0 0
# /spare
UUID=12ab4d13-398e-4af2-9a76-b888aafbab10 /spare reiserfs notail,noatime,user_xattr 0 2
# /var
UUID=7938e468-01e4-4be5-9a5d-db29da37ced4 /var reiserfs notail,noatime,user_xattr 0 2
# swap
UUID=9a0d1319-da63-4947-96e5-66b056dcf7f0 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
LABEL=mirror /mirror btrfs space_cache,compress=lzo 0 2
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /
UUID=a2a19a05-0ab1-4384-839c-2c1a9dd245fc / reiserfs notail,noatime,user_xattr 0 1
UUID=a2a19a05-0ab1-4384-839c-2c1a9dd245fc /mnt/root reiserfs notail,noatime,user_xattr 0 0
UUID=7938e468-01e4-4be5-9a5d-db29da37ced4 /mnt/root/var reiserfs notail,noatime,user_xattr 0 0
# /spare
UUID=12ab4d13-398e-4af2-9a76-b888aafbab10 /spare reiserfs notail,noatime,user_xattr 0 2
# /var
UUID=7938e468-01e4-4be5-9a5d-db29da37ced4 /var reiserfs notail,noatime,user_xattr 0 2
# swap
UUID=9a0d1319-da63-4947-96e5-66b056dcf7f0 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
LABEL=mirror /mirror btrfs space_cache,compress=lzo 0 2
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