How to tackle enumerating mount points

[luke-goddard]

One of the scans is going to iterate through all the mount points and check if they're encrypted.

I did a bit of research and found the following file systems

File system type	supports encryption	encrypted by default
VFAT	?	?
exFAT	?	?
mkexfatfs(8)	?	?
F2FS	?	?
ext3	?	?
ext4	?	?
HFS	?	?
HFS+	?	?
JFS	?	?
NILFS2	?	?
NTFS	?	?
ReiserFS	?	?
UDF	?	?

I also know of Luks, that to my knowledge works on all filesystem types as a separate layer on top.

Without using blkid how would I get all mount points and test if they're encrypted?

I encrypted a USB with luks/etx4 and mounted it but /proc/mounts did not show indication of encryption.

 /dev/mapper/reddrive /mnt ext4 rw,relatime 0 0