Sometimes I need to check fstypes of mounted volumes. The solutions provided required using grep to look for ^/dev, however with all the flags available in df I felt this could be done using just the regular args. You can use the -x arg to take off fstypes that you don’t want to appear.
$ df --output=source,fstype,target -x devtmpfs -x tmpfs -x vfat -x squashfs Filesystem Type Mounted on /dev/vda1 ext4 /
Rush Simonson III 