diff --git a/filter.go b/filter.go
deleted file mode 100644
index 5cdcf2d..0000000
--- a/filter.go
+++ /dev/null
@@ -1,88 +0,0 @@
-package afero
-
-import (
-	"os"
-	"time"
-)
-
-// An afero Fs with an extra filter
-//
-// The FilterFs is run before the source Fs, any non nil error is returned
-// to the caller without going to the source Fs. If every filter in the
-// chain returns a nil error, the call is sent to the source Fs.
-//
-// see the TestReadonlyRemoveAndRead() in filter_test.go for an example use
-// of filtering (e.g. admins get write access, normal users just readonly)
-type FilterFs interface {
-	Fs
-	AddFilter(FilterFs)
-	SetSource(Fs)
-}
-
-type Filter struct {
-	source Fs
-}
-
-func (f *Filter) SetSource(fs Fs) {
-	f.source = fs
-}
-
-// create a new FilterFs that implements Fs, argument must be an Fs, not
-// a FilterFs
-func NewFilter(fs Fs) FilterFs {
-	return &Filter{source: fs}
-}
-
-// prepend a filter in the filter chain
-func (f *Filter) AddFilter(fs FilterFs) {
-	fs.SetSource(f.source)
-	f.source = fs
-}
-
-func (f *Filter) Create(name string) (file File, err error) {
-	return f.source.Create(name)
-}
-
-func (f *Filter) Mkdir(name string, perm os.FileMode) (error) {
-	return f.source.Mkdir(name, perm)
-}
-
-func (f *Filter) MkdirAll(path string, perm os.FileMode) (error) {
-	return f.source.MkdirAll(path, perm)
-}
-
-func (f *Filter) Open(name string) (File, error) {
-	return f.source.Open(name)
-}
-
-func (f *Filter) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
-	return f.source.OpenFile(name, flag, perm)
-}
-
-func (f *Filter) Remove(name string) (error) {
-	return f.source.Remove(name)
-}
-
-func (f *Filter) RemoveAll(path string) (error) {
-	return f.source.RemoveAll(path)
-}
-
-func (f *Filter) Rename(oldname, newname string) (error) {
-	return f.source.Rename(oldname, newname)
-}
-
-func (f *Filter) Stat(name string) (os.FileInfo, error) {
-	return f.source.Stat(name)
-}
-
-func (f *Filter) Name() string {
-	return f.source.Name()
-}
-
-func (f *Filter) Chmod(name string, mode os.FileMode) (error) {
-	return f.source.Chmod(name, mode)
-}
-
-func (f *Filter) Chtimes(name string, atime, mtime time.Time) (error) {
-	return f.source.Chtimes(name, atime, mtime)
-}