Use string comparision only if case of searching for NFS shares

---
 src/fuser.c |   29 +++++++++++++++++++++--------
 src/fuser.h |    2 +-
 2 files changed, 22 insertions(+), 9 deletions(-)

--- src/fuser.c
+++ src/fuser.c	2017-06-20 14:30:08.176217649 +0000
@@ -2007,6 +2007,7 @@ static void clear_mntinfo(void)
 
 static void init_mntinfo(void)
 {
+	char type[256];
 	char mpoint[PATH_MAX*4 + 1]; // octal escaping takes 4 chars per 1 char
 	int mid, parid, max = 0;
 	uint maj, min;
@@ -2018,8 +2019,8 @@ static void init_mntinfo(void)
 	if ((mnt = fopen("/proc/self/mountinfo", "r")) == (FILE *) 0)
 		return;
 	while (fscanf
-	       (mnt, "%i %i %u:%u %*s %s %*[^\n]", &mid, &parid, &maj, &min,
-		&mpoint[0]) == 5) {
+	       (mnt, "%i %i %u:%u %*s %s %*s %*s - %s %*[^\n]",
+		&mid, &parid, &maj, &min, &mpoint[0], &type[0]) == 6) {
 		const size_t nlen = strlen(mpoint);
 		mntinfo_t *restrict mnt;
 		if (posix_memalign
@@ -2038,6 +2039,9 @@ static void init_mntinfo(void)
 		mnt->parid = parid;
 		mnt->dev = makedev(maj, min);
 		mnt->id = mid;
+		if (strncmp("nfs", type, 3) == 0)
+			mnt->nfs = 1;
+		else	mnt->nfs = 0;
 		if (mid > max)
 			max = mid;
 	}
@@ -2105,16 +2109,25 @@ static int mntstat(const char *path, str
 		if (nlen < mnt->nlen)
 			continue;
 		if (mnt->nlen == 1) {	/* root fs is the last entry */
-			buf->st_dev = mnt->dev;
-			buf->st_ino = 0;
-			return 0;
+			if (mnt->nfs) {
+				fprintf(stderr, "NFS %s\n", use);
+				buf->st_dev = mnt->dev;
+				buf->st_ino = 0;
+				return 0;
+			}
+			errno = 0;
+			return stat(path, buf);
 		}
 		if (use[mnt->nlen] != '\0' && use[mnt->nlen] != '/')
 			continue;
 		if (strncmp(use, mnt->mpoint, mnt->nlen) == 0) {
-			buf->st_dev = mnt->dev;
-			buf->st_ino = 0;
-			return 0;
+			if (mnt->nfs) {
+				buf->st_dev = mnt->dev;
+				buf->st_ino = 0;
+				return 0;
+			}
+			errno = 0;
+			return stat(path, buf);
 		}
 	}
 	errno = ENOENT;
--- src/fuser.h
+++ src/fuser.h	2017-06-20 14:28:48.013689702 +0000
@@ -91,7 +91,7 @@ struct mount_list {
 # include "lists.h"
 typedef struct mntinfo_s {
     list_t   this;
-    int id, parid;
+    int id, parid, nfs:1;
     dev_t     dev;
     size_t   nlen;
     char  *mpoint;