/opt/bin/opkg install samba36-server

vi /opt/etc/samba/smb.conf

[global]
netbios name = XunLei
display charset = UTF-8
interfaces = 127.0.0.1/8 lo 192.168.0.123/24 br-lan
server string = XunLei Share
unix charset = UTF-8
workgroup = MSHOME
browseable = yes
deadtime = 30
domain master = yes
encrypt passwords = true
enable core files = no
# guest account = nobody
guest account = root
guest ok = yes
# invalid users = root
local master = yes
load printers = no
map to guest = Bad User
max protocol = SMB2
min receivefile size = 16384
null passwords = yes
obey pam restrictions = yes
os level = 20
passdb backend = smbpasswd
preferred master = yes
printable = no
security = user
smb encrypt = disabled
smb passwd file = /opt/etc/samba/smbpasswd
socket options = TCP_NODELAY IPTOS_LOWDELAY
syslog = 2
use sendfile = yes
writeable = yes

[homes]
comment = Home Directories
browsable = no
read only = no
create mode = 0750

[xl_USB]
path = /media/sda1
read only = no
guest ok = yes
interfaces = 127.0.0.1/8 lo 192.168.0.123/24 br-lan

[xl_TF]
path = /media/mmcblk0p1
read only = no
guest ok = yes
interfaces = 127.0.0.1/8 lo 192.168.0.123/24 br-lan