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Re:ZFS is the FS for Containers in Ubuntu 16.04 by jgworks on Thursday February 18, 2016 @11:23AM (#11126845)
Does this include a fix for this bug?

https://github.com/zfsonlinux/zfs/issues/1548

Re:ZFS is the FS for Containers in Ubuntu 16.04 by faragon on Thursday February 18, 2016 @05:00PM (#11129656)
Check if this works for your case:

echo > myfile

P.S. not the "solution", but may help in case you fill the disk by accident, and need to make some room before a remount cycle. P.S.2. this could help also when your disk is already 100% full, without enough space for deleting files -not enough space for new inodes- (I tested that case on ZFS NAS with no left space at all, and worked).