OnePlus3:/ # mount
rootfs on / type rootfs (ro,seclabel,size=2843132k,nr_inodes=710783)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=2920416k,nr_inodes=730104,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,seclabel,relatime)
none on /acct type cgroup (rw,relatime,cpuacct)
tmpfs on /mnt type tmpfs (rw,seclabel,relatime,size=2920416k,nr_inodes=730104,mode=755,gid=1000)
none on /config type configfs (rw,relatime)
none on /dev/cpuctl type cgroup (rw,relatime,cpu)
pstore on /sys/fs/pstore type pstore (rw,seclabel,relatime)
/dev/block/sde20 on /system type ext4 (ro,seclabel,noatime,discard,data=ordered)
/dev/block/sda15 on /data type btrfs (rw,seclabel,nosuid,nodev,noatime,compress=lz4,ssd_spread,discard,space_cache,autodefrag,subvolid=257)
/dev/block/sda3 on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,discard,data=ordered)
/dev/block/sda2 on /persist type ext4 (rw,seclabel,nosuid,nodev,relatime,discard,data=ordered)
/dev/block/sde12 on /dsp type ext4 (ro,seclabel,nosuid,nodev,relatime,discard,data=ordered)
/dev/block/sde11 on /firmware type vfat (ro,context=u:object_r:firmware_file:s0,relatime,uid=1000,gid=1000,fmask=0337,dmask=0227,codepage=437,iocharset=iso8859-1,shortname=lower,errors=remount-ro)
/dev/block/sde23 on /bt_firmware type vfat (ro,context=u:object_r:bt_firmware_file:s0,relatime,uid=1002,gid=3002,fmask=0333,dmask=0222,codepage=437,iocharset=iso8859-1,shortname=lower,errors=remount-ro)
tmpfs on /storage type tmpfs (rw,seclabel,relatime,size=2920416k,nr_inodes=730104,mode=755,gid=1000)
/dev/block/loop0 on /su type ext4 (rw,seclabel,noatime,data=ordered)
/dev/block/loop0 on /system/xbin/su type ext4 (rw,seclabel,noatime,data=ordered)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
/data/media on /mnt/runtime/default/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6)
/data/media on /storage/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6)
/data/media on /mnt/runtime/read/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=23)
/data/media on /mnt/runtime/write/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7)