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

Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs            3131420  1860   3129560   1% /run
tmpfs            1565708  4120   1561588   1% /run/user/1000
tmpfs            1565708    48   1565660   1% /run/user/0
tmpfs            7828544 35312   7793232   1% /tmp
tmpfs               4096     0      4096   0% /dev
tmpfs            7828544    12   7828532   1% /dev/shm