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Why am I seeing two roots on 'df' but not on 'mount'? I'm using zfs.

root@a:/$ df -h
Filesystem           Size  Used Avail Use% Mounted on
rootfs               4.0G  3.2G  801M  80% /
udev                 3.8G  4.0K  3.8G   1% /dev
tmpfs                1.6G  720K  1.6G   1% /run
rpool/ROOT/ubuntu-1  4.0G  3.2G  801M  80% /
cgroup               3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs                3.9G  4.0K  3.9G   1% /tmp
none                 5.0M     0  5.0M   0% /run/lock
none                 3.9G     0  3.9G   0% /run/shm
/dev/sda1             16M  5.8M  9.8M  37% /boot/grub
big                  1.7T     0  1.7T   0% /big
big/home             1.7T     0  1.7T   0% /home
big/home/user1       1.8T  124G  1.7T   7% /home/user1
rpool                801M     0  801M   0% /rpool
rpool/ROOT           801M     0  801M   0% /rpool/ROOT

Yet 'mount' shows this:

root@a:/$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=3981832k,nr_inodes=995458,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,relatime,size=1609884k,mode=755)
rpool/ROOT/ubuntu-1 on / type zfs (rw,relatime,xattr)
none on /sys/fs/fuse/connections type fusectl (rw,relatime)
cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
none on /sys/kernel/debug type debugfs (rw,relatime)
none on /sys/kernel/security type securityfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,noatime)
none on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
none on /run/shm type tmpfs (rw,nosuid,nodev,relatime)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,relatime,perf_event)
/dev/sda1 on /boot/grub type ext3 (rw,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered)
big on /big type zfs (rw,relatime,xattr)
big/home on /home type zfs (rw,relatime,xattr)
big/home/user1 on /home/user1 type zfs (rw,relatime,xattr)
rpool on /rpool type zfs (rw,relatime,xattr)
rpool/ROOT on /rpool/ROOT type zfs (rw,relatime,xattr)
gvfs-fuse-daemon on /var/lib/lightdm/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,relatime,user_id=108,group_id=115)
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