Installing GRUB to encrypted partition doesn't work if (root) is F2FS

I'm trying to setup a new Arch Linux installation with encrypted /boot partition, as described here: https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Encrypted_boot_partition_.28GRUB.29

I'm creating three partitions with cgdisk:

/dev/sda1 - Type ESP (ef00) Size 100MiB
/dev/sda2 - Type Linux (8300) Size 200MiB - for /boot (after encryption)
/dev/sda3 - Type Linux LVM (8e00) Size 12GiB - for / (after encryption)

Then I'm following with these commands:

mkfs.fat -F32 /dev/sda1 cryptsetup luksFormat /dev/sda2 cryptsetup open /dev/sda2 cryptoboot mkfs.ext2 /dev/mapper/cryptoboot mkdir /mnt/boot mount /dev/mapper/cryptoboot /mnt/boot mkdir /mnt/boot/efi mount /dev/sda1 /mnt/boot/efi cryptsetup luksFormat /dev/sda3 cryptsetup open /dev/sda3 cryptosystem mkfs.f2fs /dev/mapper/cryptosystem mount /dev/mapper/cryptosystem /mnt # edit "/etc/pacman.d/mirrorlist" as needed pacstrap /mnt base grub-efi-x86_64 efibootmgr dosfstools f2fs-tools genfstab -U /mnt >> /mnt/etc/fstab arch-chroot /mnt # remember to configure time, locale, language and hostname # edit "/etc/mkinitcpio.conf" # HOOKS="base udev autodetect modconf block keymap encrypt lvm2 filesystems keyboard fsck" mkinitcpio -p linux # edit "/etc/default/grub" # GRUB_CMDLINE_LINUX="cryptdevice=/dev/sda3:lvm" # GRUB_ENABLE_CRYPTODISK=y grub-mkconfig -o /boot/grub/grub.cfg grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub --recheck 

I'm getting this error:

Installing for the x86_64 platform.
grub-install: error: failed to get canonical path of '/boot/efi'.

Already tried:

• Installing the fuse2 and mtools packages;

• Re-creating /boot/efi directory and re-mounting /dev/sda1to it, while in the chroot environment.

---

When using ext4 for the root partition, this last procedure works and GRUB installs - and even boots (and oddly enough, re-mounting isn't necessary, only mkdir).

But for F2FS, it's not enough, although it manages to change the error message to:

Installing for the x86_64 platform.
grub-install: error: unknown filesystem.

According to The Arch Wiki ([1], [2]) it should be possible to use F2FS for root, provided that GRUB is installed to a separate partition with another filesystem which it supports. My /boot partition is ext2. So, why won't it install?

Appreciate your help immensely.