//<ip>/downloads /mnt/downloads cifs user,gid=100,forcegid,rw,auto,username=guest,password=guest,domain=<domain>.local 0 0

mount /mnt/downloads

[user1@host mnt]$ ls -hl
total 0
drwxrwxrwx. 3 root users 0 Oct 31 13:51 downloads
[user1@host mnt]$ cd downloads
[user1@host downloads]$ touch test1
touch: cannot touch ‘test1’: Permission denied
[user1@host downloads]$ echo bla > test1
-bash: test1: Permission denied
[user1@host downloads]$ ls -hl
total 0
-rw-rw-r--. 1 1025 users 0 Oct 31 13:37 test1