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[Samba] Does samba support fsync() a directory?

Hi group:
    I need some help!
    I use samba 4.5.8
    And I mount a samba directory from CentOS 7.

    When I run such program in the mounted directory:

#include  <stdlib.h>
#include  <stdio.h>
#include  <errno.h>
#include  <fcntl.h>
#include  <string.h>
int  main()  {
	printf("open aaa\n");
 	int  fd  =  open("aaa",  O_RDONLY  |  O_DIRECTORY,  0);
 	if  (fd  <  0)  {
 	perror("open aaa");
  	printf("sync aaa\n");
  	if(fsync(fd))  {
  	perror("sync aaa");
  	return  0;

	I get such error: `sync aaa: Invalid argument`
	Is this expected for samba?
	Thanks in advance!

Best Regards

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