grub-mount - export GRUB filesystem with FUSE
grub-mount [OPTION...] IMAGE1 [IMAGE2 ...] MOUNTPOINT
Debug tool for filesystem driver.
Mount crypto devices.
Set debug environment variable.
Load zfs crypto key.
Set root device.
print verbose messages.
give this help list
give a short usage message
print program version
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
The full documentation for grub-mount is maintained as a Texinfo manual. If the info and grub-mount programs are properly installed at your site, the command
info grub-mount
should give you access to the complete manual.