Using the mount command I get the following response:
[root@ns7-1 ~]# mount
/dev/mapper/vg-lv_root on / type ext4 (rw,relatime,data=ordered)
/dev/mapper/vg-lv_root on /home type ext4 (rw,relatime,data=ordered)
/dev/sda1 on /boot type ext4 (rw,relatime,data=ordered)
df command gives:
[root@ns7-1 ~]# df -h -T
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg-lv_root ext4 37G 2.5G 33G 7% /
devtmpfs devtmpfs 988M 0 988M 0% /dev
tmpfs tmpfs 999M 0 999M 0% /dev/shm
tmpfs tmpfs 999M 78M 921M 8% /run
tmpfs tmpfs 999M 0 999M 0% /sys/fs/cgroup
/dev/sda1 ext4 477M 165M 283M 37% /boot
tmpfs tmpfs 200M 0 200M 0% /run/user/0
Looks like ext4