diff --git a/executor/stubs.go b/executor/stubs.go
index e85f10fed3df..5ea4f5edd192 100644
--- a/executor/stubs.go
+++ b/executor/stubs.go
@@ -10,7 +10,6 @@ import (
 
 	"github.com/containerd/continuity/fs"
 	"github.com/moby/buildkit/util/bklog"
-	"github.com/moby/buildkit/util/system"
 )
 
 func MountStubsCleaner(ctx context.Context, dir string, mounts []Mount, recursive bool) func() {
@@ -87,7 +86,7 @@ func MountStubsCleaner(ctx context.Context, dir string, mounts []Mount, recursiv
 				continue
 			}
 			mtime := dirSt.ModTime()
-			atime, err := system.Atime(dirSt)
+			atime, err := fs.Atime(dirSt)
 			if err != nil {
 				bklog.G(ctx).WithError(err).Warnf("Failed to stat atime of %q (parent of mount stub %q)", dir, p)
 				atime = mtime
diff --git a/util/system/atime_deprecated.go b/util/system/atime_deprecated.go
new file mode 100644
index 000000000000..6a11546087e7
--- /dev/null
+++ b/util/system/atime_deprecated.go
@@ -0,0 +1,13 @@
+package system
+
+import (
+	iofs "io/fs"
+	"time"
+
+	"github.com/containerd/continuity/fs"
+)
+
+// Deprecated: use [fs.Atime] instead.
+func Atime(st iofs.FileInfo) (time.Time, error) {
+	return fs.Atime(st)
+}
diff --git a/util/system/atime_unix.go b/util/system/atime_unix.go
deleted file mode 100644
index 9a7af36ffcc6..000000000000
--- a/util/system/atime_unix.go
+++ /dev/null
@@ -1,21 +0,0 @@
-//go:build !windows
-// +build !windows
-
-package system
-
-import (
-	iofs "io/fs"
-	"syscall"
-	"time"
-
-	"github.com/containerd/continuity/fs"
-	"github.com/pkg/errors"
-)
-
-func Atime(st iofs.FileInfo) (time.Time, error) {
-	stSys, ok := st.Sys().(*syscall.Stat_t)
-	if !ok {
-		return time.Time{}, errors.Errorf("expected st.Sys() to be *syscall.Stat_t, got %T", st.Sys())
-	}
-	return fs.StatATimeAsTime(stSys), nil
-}
diff --git a/util/system/atime_windows.go b/util/system/atime_windows.go
deleted file mode 100644
index cd5190fceb4c..000000000000
--- a/util/system/atime_windows.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package system
-
-import (
-	iofs "io/fs"
-	"syscall"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-func Atime(st iofs.FileInfo) (time.Time, error) {
-	stSys, ok := st.Sys().(*syscall.Win32FileAttributeData)
-	if !ok {
-		return time.Time{}, errors.Errorf("expected st.Sys() to be *syscall.Win32FileAttributeData, got %T", st.Sys())
-	}
-	// ref: https://github.com/golang/go/blob/go1.19.2/src/os/types_windows.go#L230
-	return time.Unix(0, stSys.LastAccessTime.Nanoseconds()), nil
-}