ogra@localhost:~$ df -h /writable/
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk1p9   57G  385M   54G   1% /writable
ogra@localhost:~$ cat /run/initramfs/resize-writable.log 
fixing backup GPT
The operation has completed successfully.
Deleting partition 9
The operation has completed successfully.
Creating partition 9 at 280576
The operation has completed successfully.
Setting GUID of partition 9 to 5216E574-04A9-4522-9819-21FEFD3F80DC
The operation has completed successfully.
Setting name of 9 to writable
Setting name!
partNum is 8
REALLY setting name!
The operation has completed successfully.
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
writable: 38/36960 files (7.9% non-contiguous), 103665/147552 blocks
resize2fs 1.42.13 (17-May-2015)
Resizing the filesystem on /dev/mmcblk1p9 to 15083259 (4k) blocks.
The filesystem on /dev/mmcblk1p9 is now 15083259 (4k) blocks long.

ogra@localhost:~$ snap list
Name                Version                   Rev   Developer  Notes
core                16-2.27.6+git362.c2cddc4  2872  canonical  core
dragonboard         16.04-0.18                32    canonical  gadget
dragonboard-kernel  4.4.0.1073.65             35    canonical  kernel
ogra@localhost:~$