ftp://ftp.uni-frankfurt.de/pub/Mirrors2/ftp.kernel.org/pub/linux/utils/fs/  direct

[DIR]xfs/  direct  6343+ twin directories
[DIR]zisofs/  direct  747+ twin directories
[DIR]reiserfs/  direct  3434+ twin directories
[DIR]reiser4/  direct  329+ twin directories
[DIR]fat/  direct  3854+ twin directories