How to resize/expand filesystem?

[OdroidC1]

so i followed the steps and got a running debian jessie.

df -h however gives:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       926M  788M  114M  88% /
devtmpfs        407M     0  407M   0% /dev
tmpfs           411M     0  411M   0% /dev/shm
tmpfs           411M   12M  399M   3% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           411M     0  411M   0% /sys/fs/cgroup
tmpfs           411M     0  411M   0% /tmp
/dev/mmcblk0p1   38M   24M   15M  63% /boot

seems like not all 32 gb of the sd card are used. how can i expand the fs?

[OdroidC1]

See:
TheSin-@94d2a31
and
TheSin-@8fdeb5a