Scope/Description

Prerequisites

SMB Packages Installed
SMB Services Running and Enabled
SMB Ports Open on Firewall (133/tcp, 445/tcp and 137/udp, 138/udp)
Local users with samba password configured.
Local group to authenticate users connecting to share(s).
Joined to an Active Directory if using Windows ACLs to manage share permissions.
Domain Group(s) that will handle assigning share permissions via Windows ACLs given SeDiskOperatorPrivilege permission.

For a basic Local User Access share, we first must ensure the permissions are set correctly on the directory we are sharing out.
The directory must be set to 770 by doing chmod 770 /path/to/share for permissions, and the owner user/group is set as root:smbgroup by doing chown root:smbgroup where smbgroup is a local group that we have any local user attempting to connect to the share a member of.
Once we have this completed, we can then utilize a share configuration similar to below to allow access.

[samba]
force group = smbgroup
inherit permissions = Yes
path = /tank/samba-dataset
read only = No
valid users = @smbgroup

For a basic Guest Access share, we first must ensure the permissions are set correctly on the directory we are sharing out.
The directory must be set to 770 by doing chmod 770 /path/to/share for permissions, and the owner user/group is set as nobody:nogroup by doing chown nobody:nogroup.
Once we have this completed, we can then utilize a share configuration similar to below to allow access.

[samba-guest]
guest ok = Yes
guest only = Yes
inherit permissions = Yes
path = /tank/samba-guest
read only = No

Ensure there are no typos within your share configuration parameters.
Ensure if using password access that the user attempting to connect is a member of the group owning the share, and has a samba password configured.
If utilizing a guest access share on a Windows client, you may have issues as by default access to guest access network shares in Windows is disabled.