is possible to filter a directory content based on its file's permission?
No internal means for that, but custom view could be used to do such filtering:
command! perm :select * | !stat -c'%%%%A/%%%%n' %%f | grep '^.%a' | cut -d/ -f1 --complement %%u perm rwx perm .w.
I would have preferred using the integrated filter like function to be honest, but thank you for giving me an alternave