What is the problem of the error in the network path when samba, is mounted with mount in centos7?

using

1. yum-y install samba samba-client samba service is installed in centos7,

2. Then go to / etc/samba/smb.conf to configure, as follows:

[global]        
        workgroup = WORKGROUP
        server string = Samba Server Version %v
        netbios name = MYSERVER
        security = user
        passdb backend = tdbsam

[smbshare]
        path = /root/smbshare  -sharp /root smbshare
        public = yes
        valid user = root
        writeable = yes
        printable = no
        create mask = 0644
        directory mask = 0755

3. Then I install
[root@linuxidc.com ~]-sharp yum-y install cifs-utils

and then I want to mount the file with the network path of / / 10.99.1.X/Digital to / root/smbshare

4. So enter the command

[root@linuxidc.com ~] mount -t cifs //10.99.1.X/Digital  /root/smbshare
Password for root@//10.99.1.X/Digital:*****    -sharp(Linuxroot)

and report an error!
Tip:

mount error(13):Permission denied 
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

how to solve this problem? online practices are not effective