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# mount
rootfs on / type rootfs (rw)
/dev/root on / type ext2 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
usbfs on /proc/bus/usb type usbfs (rw)
devpts on /dev/pts type devpts (rw)
/dev/sda1 on /usr type ext2 (rw)
# cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   bdev
nodev   proc
nodev   binfmt_misc
nodev   sockfs
nodev   pipefs
nodev   anon_inodefs
nodev   futexfs
nodev   tmpfs
nodev   devpts
        ext2
nodev   ramfs
        msdos
        vfat
nodev   autofs
nodev   mqueue
nodev   usbfs
#