'none' 在 'mount' 命令中是什么意思?

What does the 'none' mean in 'mount' command?

以下命令让我感到困惑:

# mkdir /dev/mqueue
# mount -t mqueue none /dev/mqueue

none 是什么意思?

引用自https://unix.stackexchange.com/questions/136646/what-is-type-none-for-mount-points-and-why-are-mount-points-of-the-same-type-b

"The none just means that there is no physical disk partition linked to the mount point you see when issuing the mount command. It is used for virtual filesystems like shm, ramfs, proc and tmpfs. The lock, shm and user mount points in this example are created separately so they can be mounted with different permissions and settings." -- 验证码