Name the file system developed by Theodore Ts'o with the least cardinality ?
select ?ent where { ?ent wdt:P31 wd:Q174989 . ?ent wdt:P1164 ?obj . ?ent wdt:P178 wd:Q92930. } ORDER BY ASC(?obj)LIMIT 5 
file system: Q174989 theodore ts'o: Q92930