/usr/lib/grub/x86_64-emu/fs.lst is in grub-emu 2.02~beta2-22+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | affs
afs
bfs
btrfs
cbfs
cpio
cpio_be
exfat
ext2
fat
hfs
hfsplus
iso9660
jfs
minix
minix2
minix2_be
minix3
minix3_be
minix_be
newc
nilfs2
ntfs
odc
procfs
reiserfs
romfs
sfs
squash4
tar
udf
ufs1
ufs1_be
ufs2
xfs
zfs
|