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The output of your command "$ df -F tmpfs" is:

Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs            3169500  2268   3167232   1% /run
tmpfs            1584748    96   1584652   1% /run/user/1000
tmpfs            1584748    48   1584700   1% /run/user/0
tmpfs            3169500  2268   3167232   1% /run/user
tmpfs            7923752 21592   7902160   1% /tmp
tmpfs               4096     0      4096   0% /dev
tmpfs            7923748     8   7923740   1% /dev/shm