Update gomod and vendor

vendor/github.com/moby/sys/mountinfo/mountinfo.go

@@ -1,20 +1,26 @@
 package mountinfo
 
+import (
+	"os"
+)
+
 // GetMounts retrieves a list of mounts for the current running process,
 // with an optional filter applied (use nil for no filter).
 func GetMounts(f FilterFunc) ([]*Info, error) {
 	return parseMountTable(f)
 }
 
-// Mounted determines if a specified mountpoint has been mounted.
-// On Linux it looks at /proc/self/mountinfo.
-func Mounted(mountpoint string) (bool, error) {
-	entries, err := GetMounts(SingleEntryFilter(mountpoint))
-	if err != nil {
-		return false, err
+// Mounted determines if a specified path is a mount point.
+//
+// The argument must be an absolute path, with all symlinks resolved, and clean.
+// One way to ensure it is to process the path using filepath.Abs followed by
+// filepath.EvalSymlinks before calling this function.
+func Mounted(path string) (bool, error) {
+	// root is always mounted
+	if path == string(os.PathSeparator) {
+		return true, nil
 	}
-
-	return len(entries) > 0, nil
+	return mounted(path)
 }
 
 // Info reveals information about a particular mounted filesystem. This
@@ -40,18 +46,18 @@ type Info struct {
 	// Mountpoint indicates the mount point relative to the process's root.
 	Mountpoint string
 
-	// Opts represents mount-specific options.
-	Opts string
+	// Options represents mount-specific options.
+	Options string
 
 	// Optional represents optional fields.
 	Optional string
 
-	// Fstype indicates the type of filesystem, such as EXT3.
-	Fstype string
+	// FSType indicates the type of filesystem, such as EXT3.
+	FSType string
 
 	// Source indicates filesystem specific information or "none".
 	Source string
 
-	// VfsOpts represents per super block options.
-	VfsOpts string
+	// VFSOptions represents per super block options.
+	VFSOptions string
 }