SeedFu.seed は引数に FIXTURE_PATH と FILTER を指定できる
SeedFu.seed(fixture_paths, filter)
spec_helper.rb にはこんな感じで書ける
config.before :suite do
DatabaseRewinder.clean_all
fixture_paths = "#{Rails.root}/db/fixtures"
filter = /users/
SeedFu.seed(fixture_paths, filter)
end