Hello, Marvin, I've been thinking about this problem a couple more times.
It does not make sense to maintain the list of pseudo file systems hardcoded in lsmount. Depending on the kernel, different file systems are available and some are even renamed. Accordingly, only a dynamic solution would be conceivable here which gets the information at runtime, but I have not yet found a reliable and practicable solution, I do not rule out that I will have a good idea in the future, but currently I do not see any solution that solves this satisfactorily for me. The list from /usr/share/doc/lsmount/examples/lsmount.rc.example is not complete and not the standard, but currently the most flexible solution. It may be useful to display some pseudo file systems but hide others. Therefore, I will close this bug report.
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