In this wiki article:
https://wiki.centos.org/HowTos/SetUpSamba
…there is a command down in section 2 that gives an error here on CentOS 7:
$ sudo semanage fcontext –at samba_share_t /path/to/share …noise noise noise… semanage: error: unrecognized arguments: samba_share_t /path/to/share
That and the following restorecon command can be replaced by a single shorter command, which also fixes the symptom:
$ sudo chcon -R -t samba_share_t /path/to/share