10/100 will limit at 12meg/s
It’ll depend on what you’re transferring. Large files will likely sustain 112MB/s, however small files will markedly reduce the overall speed due to the network protocol overheads . For example, a 4gb video file will sustain full speed throughout but 4gb worth of 20MB RAW photos transferred to the same drive will drop to around 30MB/s.
This is because in very simple terms, the PC has to ask to create the file, await a reply from the nas to say OK, ready, start sending the data, ask for the file to be closed and await confirmation from the nas to say closed. Each of the steps having a delay which gets in the way of actually sending file data. Then it repeats the process for the next file going through the steps again. Whereas for a single large file, it only has to negotiate once at each end of the large transfer.