Using smbclient on the Alpine Linux hosting the share, copying a file from share to /tmp results in this after about 10 seconds:
smb: \Remote\Folder\> get File.Name.Ext /tmp/File.Name.Ext parallel_read returned NT_STATUS_IO_TIMEOUT
smb: \Remote\Folder\> getting file \Remote\Folder\File.Name.Ext of size 5863869928 as /tmp/File.Name.Ext SMBecho failed (NT_STATUS_CONNECTION_DISCONNECTED). The connection is disconnected now