This file is indexed.

/usr/lib/grub/i386-pc/fs.lst is in grub-pc-bin 2.02~beta2-9ubuntu1.6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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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