+Example:
+\(setq filename-filters '\(filename-special-filter
+ filename-eliminate-top-low-lines
+ filename-canonicalize-low-lines
+ filename-maybe-truncate-by-size
+ filename-eliminate-bottom-low-lines\)\)
+
+Moreover, if you want to convert Japanese filename to roman string by kakasi,
+
+\(if \(exec-installed-p \"kakasi\"\)
+ \(setq file-name-filters
+ \(append '\(filename-japanese-to-roman-string\) filename-filters\)\)\)")