Man pages matching name proc_filesystems in section 5:

proc_filesystems.5.en	debian 13 / manpages
proc_filesystems.5.cs	debian 13 / manpages-cs
proc_filesystems.5.de	debian 13 / manpages-de
proc_filesystems.5.fr	debian 13 / manpages-fr
proc_filesystems.5.pl	debian 13 / manpages-pl
proc_filesystems.5.ro	debian 13 / manpages-ro
proc_filesystems.5.ru	debian 13 / manpages-ru