If You want that the Raspberry Pi, RPi, shall appear in MS Explorer or Mac Finder, as a File server, the easiest way is to install Samba.
This also makes it much easier if You want to edit files on the RPi with editors from Your MS/Apple device. Or maybe moving files from/to the RPi.
Log on to the RPi and install Samba
$ sudo apt-get install samba samba-common-bin
Edit the Samba configuration file so that You have more than "Read Only" rights.
$ sudo nano /etc/samba/smb.conf