Case insensitive file systems are supported in onnv_77, but this is explicitly disabled with OSX, since the 'FIGNORECASE' flag (and others) aren't supported. We might be able to bodge this with introspecting a property on the zfs type somehow in the future.

Seems that 10a286 had the same idea:

/* OS X - case insensitive file systems always perform ZCILOOK */

define ZFS_IGNORECASE(zfsvfs) \

    (zfsvfs->z_case == ZFS_CASE_INSENSITIVE)

endif

I tested maczfs with Parallels but it did not work as intended because of the lack of case-insensitivity.

MacZFS has been discontinued. Please switch to https://openzfsonosx.org/