turn-off Nlink readdir() optimization for NFS/CIFS (#19420)

fixes #19418
fixes #19416

cmd/xl-storage.go

@@ -117,6 +117,7 @@ type xlStorage struct {
 
 	nrRequests   uint64
 	major, minor uint32
+	fsType       string
 
 	immediatePurge chan string
 
@@ -254,6 +255,7 @@ func newXLStorage(ep Endpoint, cleanUp bool) (s *xlStorage, err error) {
 	}
 	s.major = info.Major
 	s.minor = info.Minor
+	s.fsType = info.FSType
 
 	if !globalIsCICD && !globalIsErasureSD {
 		var rootDrive bool